Etymology
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captaincy (n.)

"rank or commission of a captain," 1818, from captain (n.) on the model of lieutenancy or some similar word where the -c- is etymologically justified. Earlier words in the same sense were captainry (1520s), captainship (mid-15c.).

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Definitions of captaincy

captaincy (n.)
the post of captain;
Synonyms: captainship
From wordnet.princeton.edu